Different ways to pass channels as arguments in function
I was reading some go code and say a few different ways to pass go channels. Maybe they are the same but I was wondering if there is any difference since I couldn't find documentation online: 1) func serve(ch <-chan interface{}){ //do stuff } 2) func serve(ch chan<- interface{}){ //do stuff } 3) func serve(ch chan interface{}){ //do stuff } 4) func server(ch *chan interface{}){ //do stuff} I was w
Assigning null to JSON fields instead of empty strings
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Unmarshal/Marshal json with int set to 0 does not seem to work
I am trying to parse a json object into a struct, but integer values set to 0 won't work. q := []byte(`{"string":"this is a string", "integer": 0}`) type Test struct { String string `json:"string,omitempty"` Integer int `json:"integer,omitempty"` } var qq Test if err := json.Unmarshal(q, &qq); err != nil { panic(err) } queryStr, err := json.Marshal(qq) if err != nil { panic(err) } fmt.Println(stri
Difference between Pragma and Cache-Control headers?
I read about Pragma header on Wikipedia which says: "The Pragma: no-cache header field is an HTTP/1.0 header intended for use in requests. It is a means for the browser to tell the server and any intermediate caches that it wants a fresh version of the resource, not for the server to tell the browser not to cache the resource. Some user agents do pay attention to this header in responses, but the
Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.47.el6_2.9.i686 libgcc-4.4.6-3.el6.i686 libstdc++-4.4.6-3.el6.i686
CentOS 6.2 + GNU gdb (GDB) Red Hat Enterprise Linux (7.2-50.el6) When I debug a simple c++ code with GDB, I saw the following warning: Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.47.el6_2.9.i686 libgcc-4.4.6-3.el6.i686 libstdc++-4.4.6-3.el6.i686 I have tried the following methods and none of them fix the problems: Search SO yum install glibc debuginfo-install glibc-2.12-1.47.e
Where is the source for the fork() call in Linux?
Taking as reference the x86 platform and the 2.6.23 Linux kernel: Create the test-fork.c file: #include <unistd.h> int main (void) { fork(); return 0; } Compile it with static linking: gcc -O0 -static -Wall test-fork.c -o test-fork Disassemble it: objdump -D -S test-fork > test-fork.dis Open the test-fork.dis file and search for fork: fork(); 80481f4: e8 63 55 00 00 call 804d75c <__libc_fork> retu
bundling precompiled binary into electron app
Here's another method, tested with Mac and Windows so far. Requires 'app-root-dir' package, doesn't require adding anything manually to node_modules dir. Put your files under resources/$os/, where $os is either "mac", "linux", or "win". The build process will copy files from those directories as per build target OS. Put extraFiles option in your build configs as follows: package.json "build": { "e
How can I determine the MD5 digest of a given asset in the Rails asset pipeline?
I'm writing a Javascript-rich application in a Ruby on Rails 3.1 project and using Handlebars for my JS templating framework. I'm trying to figure out a way to dynamically append the MD5 digest of an asset (generated during asset precompilation on production) to my tags inside of my Handlebars template. I'm hoping that there's a hash with the asset path as the key and the MD5 digest as the value,
How to detect the end of loading of UITableView
I want to change the offset of the table when the load is finished and that offset depends on the number of cells loaded on the table. Is it anyway on the SDK to know when a uitableview loading has finished? I see nothing neither on delegate nor on data source protocols. I can't use the count of the data sources because of the loading of the visible cells only.
Rails has_one :through association
Rails has a has_one :through association that helps set up a one-to-one association with a third model by going through a second model. What is the real use of that besides making a shortcut association, that would otherwise be an extra step away. Taking this example from the Rails guide: class Supplier < ActiveRecord::Base has_one :account has_one :account_history, :through => :account end class
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Python equivalent of golang's defer statement
What's the difference between "<-chan" and "chan" as a function return type?
Why do people write "#!/usr/bin/env python" on the first line of a Python script?
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